feat(display): add chairman speech page and refine layouts

This commit introduces a new page for the Chairman of the Board's speech and includes several visual refinements for the
event display.

- Add `speech/3.html` to display the chairman's video.
- Update the committee member list.
- Adjust font sizes, colors, and element positioning on the main and committee list pages for better visual
presentation.
- Fine-tune background video placement and scaling.

20251012/commitee-list/background.js

@@ -41,7 +41,7 @@
     // topOffset: -200,
     // scalePercent: 125
     leftMargin: 0,
-    topOffset: -200,
+    topOffset: -100,
     scalePercent: 125,
     rotationDeg: 0,
     opacityPercent: 100,